Peer-reviewed literature and unpublished reports

Brower, L.P. and R.M. Pyle. 2004. The interchange of migratory monarchs between Mexico and the western United States, and the importance of floral corridors to the fall and spring migrations. In G.P. Nabhan, ed., Conserving migratory pollinators and nectar corridors in western North America, pp. 144-166. Tucson: University of Arizona Press.

Voss, E.G. 1954. The butterflies of Emmet and Cheboygan Counties, Michigan with other notes on Northern Michigan butterflies. The American Midland Naturalist 51(1): 87-104.

Weiss, S. 2011. Management plan for Monarch Grove Sanctuary: Site assessment and initial recommendations. Prepared for the City of Pacific Grove. 26 pp.

Western Monarch and Milkweed Occurrence Database. 2017. Data accessed from the Western Monarch Milkweed Mapper, a project by the Xerces Society, U.S. Fish and Wildlife Service, Idaho Department of Fish and Game, and Washington Department of Fish and Wildlife. Available: www.monarchmilkweedmapper.org. Accessed: January 2017.

Yahner, R. H. and G. S. Keller. 2000. Inventory of bird and butterfly diversity at Allegheny Portage Railroad National Historic Site and Johnstown Flood National Memorial. Final report to the National Park Service.

Plant Guides

Plant Species Ranges

Kartesz, J.T., The Biota of North America Program (BONAP). 2015. North American Plant Atlas. (http://bonap.net/napa). Chapel Hill, N.C. [maps generated from Kartesz, J.T. 2015. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP). (in press)].

Western Monarch and Milkweed Occurrence Database. 2017. Data accessed from the Western Monarch Milkweed Mapper, a project by the Xerces Society, U.S. Fish and Wildlife Service, Idaho Department of Fish and Game, and Washington Department of Fish and Wildlife. Available: www.monarchmilkweedmapper.org. Accessed: [January 2017].